Vacuum-pump.



PATENTED FEB. 19, 1907.

' J. J. MULLAN.

VAGUUM PUMP. APEFLIOATION FILED AUG.4,1905.

3 SHEETS-SHEET 1.

No. 844,734. PATENTED FEB. 19, 1907.

IQJ. MULLAN- VACUUM PUMP. APPLICATION FILED AUG.4.1905.

3 SHEETS-SHEET 2.

j -d fvuw PATENTED EEK/19, J. 1. MULLAN. vApUUM PUMP. APPLICATION FILED AUG.4,1906.

a sums-sum a;

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Feb 19,1907.

Application filed August}, 1905. Serial No. 272,656.

To all whom it may concern.-

Beit known that I, JOSEP J. MULLAN,a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Perms lvania, have invented an Improvement in%acuumPumps, of which the followingis a specification- .My invention relates to vacuum-pumps, and particularly to that t e which may be termed a valveless suction double-acting wet vacuum-pump; I am aware that valveless suction-pumps per se are not new; but

thiaclass of pump as heretofore constructed embodied features-such, for example, as an excessive clearance between the ends of the piston travel and the discharge-valvesm aking it necessary to employ excessively large 1 pumps or run the pumps at an abnormally ciency.

highspeed to performa given duty and also causing these pumps to be of general low efli- In carrying out my invention I employ a cylinder, a lining therefor, a piston therein, heads for said cylinder having valve-seats therein and valves connected thereto, casings surrounding said 0 linder-heads, heads for said casings provi ing water-chambers between the same and the said cylinder-heads, a longitudinal casing extending between the aforesaid casings and preferably integral therewith, providing a communicating passage between said water-chambers, a suctioninlet connection on said longitudinal casing extending through the said passagetherein and communicating with the interior of the said cylinder through suitable openings provided in the cylinder-lining adjacent to the inner orifice of the said inlet connection, a discharge-outlet connection also onsaid longitudinal casing, and means'for equalizing the pressure-on opposite sides of the said piston, all of which Wlll be hereinafter more particularly set forth. I

In the drawings, Figure l is a side elevation of my improved vacuum-pump. Fig; 2 is a plan of the same. Fig; 3 is a central vertical longitudinal section of the pump. Fig.-

4 is a central transverse section, the herein before-described figures being illustrations of a double pump. Fig. 5 is a central vertical 'long1tudinal'section of a single pump, and

Fig. 6 isan end view of the stem of=a dis charge-valve.

Referring 'tothe drawings, a. designates ,a pump-cylinder provided with a lining b, of

bronze'or any other suitable material. Within the lining b a piston c is employed, as is customary, the eripheral surface of which may be provided with snap-rings 2, as indicated in Fig. 3, for the purpose of packing the piston, or the peripheral surface of the piston.

may be provided with a series of circumferential grooves 3, as indicated in Fig. 5, for the same purpose. A piston-rod d is connected to the piston c in any customary manvided with heads e, secured thereto in any desired manner and provided in suitable positions with valve-seats 4.

Each of the valves 5 em loyed in my improved pump is preferab y provided centrally with a bushing 6, through which the valve-stem 7 passes, and is secured centrally in a valve-seat, the head .of the valve-stem being enlarged and provided with a suitablyshaped recess 9 to receive a tool for fitting the valve in place and ad'ustin 'the same to the proper tension, whic is obtained by a helical or other'sp'rin 10, extending between the head 8 of the va ve-stem and a disk 11,

surrounding said stem and bearing against the outer surface of the valve 5, and. the bushing 6 sliding on the stem in the actuation of the valve relieves the valve per se of the weargcaused by the movement thereof. The ends of the cylinder are provided with her, and the ends of the cylinder a are procasings f, preferably concentric with the same, but of considerably greater'diameter,

and the said casingls f are each provided with l a head 9, secured t ereto in any desired manner and roviding between the same and the heads 0 the cylinder water-chambers into which the air and water in the operation of the 7 pump are discharged through the said valves,

5, and h is a casing extending longitudinally between the casings 7. f and providing a communicating passage'between said chambers.

The casing-heads g are preferably so constructed as to be provided with immediate packing-glands 12 and remote packingglands'13, a well 14 being provided between the glands .13 and 14 for the reception of water or other liquid to effect a seal. A suction-inlet connection '1', is provided, extending from a point exteriorly of the longitudinal casingh through the same, through the com- 'municating assage formed by the longitudinalcasing ymeans of the walls 15, and into the'interior of the cylinder a by way of suitable ports or openings 16, arranged in the lining b adjac int to the inner orifice of the said section-inlet connection. The ports 16 may be arranged at an angle, as indicated in Figs. 2 and 3, this being necessary when the snap-rings are employed as a piston-packing in order to prevent the displacement of the same, or, as indicated in Fig. 5, a central strengthening-rib 17 may be provided in the cylinder-lining at the inner orificeof the suction connection 1', the ports or openings extending circumferentially at either side of the said rib 17 between the opposite Walls of the said orifice, and 7c designates a dischargeoutlet connection, preferably also on the longitudinal casing h and communicating with the passage provided thereby from the said water-chambers at the ends of the cylinder. .1 also find it necessary to employ a means for equalizing the pressure on opposite sides of the piston, which is found particularly ne'ces sary in starting the pump. In the present case and as illustrated such a means may constitute pipe connections 18, communicating at opposite ends of the cylinder with the interior thereof, and pipe connections 19 with theintervening check-valves 20, the adj acent ends of the pipes 19 being secured in the opposite ends of a T 21, from which apipe 22 communicates with the passage provided by the longitudinal member h, and the checkv alves 20 are preferably rovided with stems and. hand-wheels23. A ter the pump is fully under way these valves may be closed, as the same are not then absolutely necessary.

may also be conveniently provided with suit able taps in the cylinder and casings f thereof for the reception, respect,ively, of suitable plugs 24 and 25 for drair'iage purposes, and, as indicated in Fig. 5, in'the single pump st-ructure, or, for that matter, in lieu of the liquid seals (shown in Figs. 1, 2, and 3) I ma employ acage-seal, (indicated at 26,) centra ly above which a ta 27 is provided for the reception of a suit'a'b e vessel for containing the hquid to effect the seal. 4

From the foregoing. description and the drawings will be apparent that the bodyof the pump, which is an integral structure of cast inetal, comprises the following parts; the Dump-cylinder a; the casings and'flanged portions f at each end of the cylinder, which extend therefrom to the full length of thepump-body; the casing 72-, in width agreeing withthe diameter of the cylinder and ex tendgap and arched ever; the centrally-disposed iilnged section-inlet i, whichin cross-section,

'4, broadens to the inner diameter of the cylinder and in longitudinal section, Fig. 13,

contracts appreciably by the walls 15, and the discharge-outlet is, formed by outward extensions from opposite sides of the sectioninlet see Fig. 2 around the same, and which terminate in a flange to which a dischargepipe is to be secnred.

The pump structure hereinbefore described I claim as my invention? 1. In a double-acting valveless suction vacuum-pump, the combination with a cyl-' tion passing through the said casing and lead- 1 ing into said cylinder, and a discharge connection leading from the said casing.

2. In a double-acting valveless suction vacuum-pump, the combination with a cylinder, a piston and piston-rod therefor, of heads for the ends of said cylinder, valves and valve-seats therein, casings surrounding the ends of said cylinder, a casing extending between the aforesaid casings, a suction connection passing throu l the said casing and leadinginto said cylin er a'discharge'connection leading from thelsai casing, and means for equalizing the pressure on opposite sides of the piston. f i V r 3. In adouble-acting. 'valveless suction vacuum-pump, the combination with a cylindenpiston and piston-rod therefor, of a lining fitting within said cylinder, heads'for the said cylinder, valves and valve-seats in the cylinderrheads, casings surrounding the ends of sai-dcyiinder, a casing extending between the aforesaid casings, a suction connection passing through said casing and leading into said cylinder throu h suitable orts provided in the said lining a j acent to t e inner orifice of said. suction connection and a discharge connection also leading from the said casing.

4. In a double acting valveless suction vacuum-pump, the combination'witha cylinder, piston, and piston-rod therefor, of a lining fitting within said cylinder, heads for the said cylinder, valves and valveeseats in the cylinder-heads, casings surrounding the ends of said cylinder, a casingextending between the aforesaid casings, a suction connection passing throu hsaid casin and leading into said cylindert ough'suita le orts provided in the said lining adjacent to t e inner orifice of said suctionconnection, a discharge con nection also leading from the said casing, and means for equalizing the pressure on opposite sides of the piston.

5. In a double-acting valveless suction vacuum-pump, the combination with a -,cylinder, a piston and piston-rod therefor, of a lining fittingwithin said cylinder, heads secured to the ends of. said cylinder, dischargevalves and valve-seats therefor in the said cylinder-heads, casings surrounding the ends of said cylinder, heads for the said casings providing chambers between the same and the said cylinder-heads into which the vapor and liquid are discharged through said valves, a longitudinal casing extending between the aforesaid casings and providing'a communicatingpassage between the said through suitable openings provided in thesaid lining adjacent to the inner orifice of the said suction-inlet. connection, and a discharge-outlet connection on the said longitudinal casing and communicating with the passage provided thereby.

6. n a double-acting valveless suction vacuum-pump, the combination with a cyl inder, a piston-and piston-rod therefor, of a lining fitting within said cylinder, heads secured to the endsof said cylinder, dischargevalves and valve-seats therefor in the said cylinder-heads, casings surrounding the ends.

of said cylinder, heads for the said casings providing chambers between the same and the said cylinder-heads into which the vapor and liquid are discharged through said valves, packing-glands secured to the last aforesaid eads, intermediate liquid seals between the said packing-glands, a longitudinal casing extending between the aforesaid casings and providing a communicating passage between the said chambers, a suction-inlet connection leading through the said communicating passage in the longitudinal easing into the said cylinder, through suitable openings provided in the said lining adjacent to the inner orifice of the said suction-inlet connectionfand a discharge-outlet connection on the ,said longitudinal casing and communicating with the passage provided thereby.

7. In a doubleacting valveless suction vacuum-pu1np,-the combination with a cylinder, a piston and piston-rod therefor, of a linin fitting within said cylinder, heads secured tothe ends of said cylinder, dischargevalves and valve-seats therefor in the said cylinder-heads, casings surrounding the ends of said cylinder, heads for the said casings providing chambers between the same and the said cylinder-heads into which the vapor and liquid are discharged through said valves,

a longitudinal casing extending between the aforesaid casings and providing a communieating passage between the said chambers, a suction-inlet connection leading through the said communicating passage in the longitudinal easing into the said cylinder through suitable openings provided in the said lining adjacent to the inner orifice of the said suction-inlet connection, and a discharge-outlet connection on the said longitudinal casing and communicating with the passage pro- Vided thereby, pipe connections leading from the opposite ends of the said cylinder into the communicating passage provided by sale longitudinal casing, and check-valves suitably laced in the said pipe connections.

8. in a double-acting valveless suction vacuum-pump, the combination with a cylinder, piston and piston-rod therefor, of heads for the ends of said cylinder, dischargevalves and valve-seats therein, casings surrounding the ends of said'cylinder, a casing extending between the aforesaid casings, a suction connection leading centrally to the said cylinder, a lining for the said cylinder provided with a series of. apertures placed at an angleadjacent to the inner orifice of said suction-inlet connection, snap-rings for packing said piston, and a discharge-outlet connection leading from the said longitudinal casing.

9. In a vacuum-pump, a body of integral structure coinprisinga cylinder, casings and 'fianged portions at the ends of 'said cylinder which extend therefrom to the full length of the pump-body, a casing in width agreeing with the diameter of the cylinder and extending up and arched over a centrally-disposed flanged. suction-inlet which in transverse section broadens to the inner dianteter of the said cylinder and in longitudinal section contracts appreciably by walls within the said casing, and a discharge-outlet formed by outward extensions from the opposite sides of the said suction-inlet around the saute and which terminate in a flange, substantiallv as described.

Signed by me this 26th day of July, 1905 I JQSEPH J. MULLAN.

NVitnesses RODNEY MoRRIsoN, WM. B. SOU'DER. 

